<template>
  <Header></Header>
  <div class='coursemain'>
    <div class="course-main">
      <section class="search-container">
        <div class="search-item">
          <div class="title-name">课程方向：</div>
          <div class="all-items">
            <el-tag class="category-poniter" effect="plain" type="info">全部</el-tag>
            <el-tag v-for='item in firstCategorys' :key='item.id'
              :class="currentId['fcategory'].id == item.id ? 'category-poniter' : 'category-poniter-item'" effect="plain"
              type="info" @click='buildingCondition("fcategory", item.id)'>
              {{ item.categoryName }}
            </el-tag>
          </div>
        </div>
        <div class="search-item search-item-transition" style="top: 45px;">
          <div class="title-name">课程分类：</div>
          <div class="all-items">
            <el-tag class="category-poniter" effect="plain" type="info">全部</el-tag>
            <el-tag v-for='item in secondCategorys' :key='item.id'
              :class="currentId['scategory'].id == item.id ? 'category-poniter' : 'category-poniter-item'" effect="plain"
              type="info" @click='buildingCondition("scategory", item.id)'> {{ item.categoryName }}
            </el-tag>
          </div>
        </div>
        <div class="search-item" style="top: 90px;">
          <div class="title-name">课程难度：</div>
          <div class="all-items">
            <el-tag class="category-poniter" effect="plain" type="info">全部</el-tag>
            <el-tag v-for='item in courseLevel' :key='item.id'
              :class="currentId['clevel'].id == item.code ? 'category-poniter' : 'category-poniter-item'" effect="plain"
              type="info" @click='buildingCondition("clevel", item.code)'> {{ item.text }}
            </el-tag>
          </div>
        </div>
      </section>
    </div>
    <div class='main-container'>
      <div class="container-top">
        <ul class="all">
          <li class="item" @click="handleZonghe" :style='priceSortBy == "1" ? "color:#2C80FF" : ""'>综合</li>
          <li class="item split">|</li>
          <li class="item" @click="handleNewCourse" :style='priceSortBy == "2" ? "color:#2C80FF" : ""'>最新课程</li>
          <li class="item split">|</li>
          <li class="item" @click="mostbuy" :style='priceSortBy == "3" ? "color:#2C80FF" : ""'>最多购买 </li>
          <li class="item split">|</li>
          <li class="item-price" @click="handlePrice">
            <span :style='priceSortBy == "4" || priceSortBy == "5" ? "color:#2C80FF" : ""'>价格</span>
            <span class="arrow">
              <el-icon :style='priceSortBy == "4" ? "color:#2C80FF" : ""'><caret-top /></el-icon>
              <el-icon :style='priceSortBy == "5" ? "color:#2C80FF" : ""'><caret-bottom /></el-icon>
            </span>
          </li>
        </ul>
        <ul class="right">
          <li class="right-item">
            <el-radio-group v-model="radio">
              <el-radio label="1">免费课程</el-radio>
              <el-radio label="2">会员课程</el-radio>
            </el-radio-group>
          </li>
        </ul>
      </div>
      <div class="container-body">
        <div class="newCourseContent">
          <ul class="courseUl">
            <li class='courseItem' v-for='item in courseList' :key='item.id'>
              <router-link :to="{ path: '/course-info/' + item.id }">
                <div class='courseInfo'>
                  <div class='courseBg'>
                    <img :src="item.courseCover">
                  </div>
                  <div class="courseName">{{ item.courseName }}</div>
                  <div class="courseDegree">{{ courseTypeFn(item.courseLevel) }} · {{ item.purchaseCounter +
                    item.purchaseCnt }}人报名</div>

                  <div class="coursePriceZero" v-if="item.discountPrice == 0">
                    <div class="pricefree">免费学习</div>
                    <img src="../assets/img/free.png" alt="">
                  </div>

                  <div class="coursePrice" v-else-if="item.isMember == 1">
                    <div class="courseMemberbg"><span class="courseMember">会员免费</span></div>
                    <div class="price">¥ {{ item.discountPrice }}</div>
                  </div>

                  <div class="coursePricePri" v-else>
                    <div class="pricePri">¥ {{ item.discountPrice }}</div>
                  </div>
                </div>
              </router-link>
            </li>
          </ul>
        </div>
        <div class='pages'>
          <el-pagination background layout="prev, pager, next" :total="total" @current-change='handleCurrentChange' />
        </div>
      </div>
    </div>
  </div>
  <Foot></Foot>
</template>


<script setup>
import { CaretTop, CaretBottom } from "@element-plus/icons-vue";
import Header from '../components/common/Header.vue'
import Foot from '../components/common/Foot.vue'

import { getFirstCategorys, getSecondCategorys, searchCourse } from '../utils/api/courseManage'

import mixin from '../mixins/courseType.js'
let { courseTypeFn } = mixin();

//课程方向的数据
let firstCategorys = ref([]);
//课程分类的数据
let secondCategorys = ref([]);
let category = reactive({
  categoryId: -1
})
//课程难度的数据
let courseLevel = [
  { text: '初级', code: '1' },
  { text: '中级', code: '2' },
  { text: '高级', code: '3' }]
//所有课程的数据
let courseList = ref([]);
//查询课程的参数
let searchCourseParams = reactive({
  pageNum: 1,
  pageSize: 8
});
//分页的数据
let total = ref(0);

// 标签激活项配置
let currentId = reactive({
  fcategory: { id: '' },
  scategory: { id: '' },
  clevel: { id: '' }
})

// 免费课程 和 会员课程的数据
const radio = ref('0')
// 控制价格 升降序
let priceSortBy = ref('1');

//查询所有课程
const queryCourseList = async () => {
  //查询所有课程
  const res = await searchCourse(searchCourseParams)

  courseList.value = res.data.pageInfo.list;
  total.value = res.data.pageInfo.total;
}

//请求二级分类
const getSecondCategorysFn = (category) => {
  getSecondCategorys(category).then(res => {
    secondCategorys.value = res.data.list;
  })
}

let queryCoursePrams = reactive({
  pageNum: 1,
  pageSize: 8,
  entity: {
    firstCategory: '',
    secondCategory: '',
    courseLevel: '',
    isMember: '',
    isFree: '',
    sortBy: ''
  }
})
const querySearchCourse = () => {
  searchCourse(queryCoursePrams).then(res => {
    courseList.value = res.data.pageInfo.list;
    total.value = res.data.pageInfo.total;
  })
}


//生命周期
onBeforeMount(async () => {
  //获取一级分类
  const res_firstCategorys = await getFirstCategorys()
  firstCategorys.value = res_firstCategorys.data.list;
  //获取二级分类
  const res_secondCategorys = await getSecondCategorys({ categoryId: -1 })
  secondCategorys.value = res_secondCategorys.data.list;
  //查询所有课程
  await queryCourseList();
})

// 处理函数，当页数发生改变时触发
const handleCurrentChange = (val) => {
  //页面的赋值
  queryCoursePrams.pageNum = val;
  //查询对应页的数据
  querySearchCourse();
}

//点击分类
const buildingCondition = (type, id) => {

  if (type === 'fcategory') {
    currentId['scategory'].id = '';
    currentId['clevel'].id = '';
    currentId[type].id = id;
    queryCoursePrams.entity.courseLevel = '';
    queryCoursePrams.entity.secondCategory = '';
    queryCoursePrams.entity.firstCategory = id;
    category.categoryId = id;
    getSecondCategorysFn(category);
    querySearchCourse();
    return;
  }
  if (type === 'scategory') {
    currentId['clevel'].id = '';
    currentId[type].id = id;
    queryCoursePrams.entity.courseLevel = '';
    queryCoursePrams.entity.secondCategory = id;
    querySearchCourse();
    return;
  }

  if (type === 'clevel') {
    currentId[type].id = id;
    queryCoursePrams.entity.courseLevel = id;
    //查询所有课程
    querySearchCourse();
    return;
  }

}

watch(radio, (newVal, oldVal) => {
  if (newVal == 1) {
    queryCoursePrams.entity.isMember = '';
    queryCoursePrams.entity.isFree = '1';
  } else if (newVal == 2) {
    queryCoursePrams.entity.isFree = '';
    queryCoursePrams.entity.isMember = '1';
  }
  querySearchCourse();
})

//综合
const handleZonghe = () => {
  priceSortBy.value = '1'
  queryCoursePrams.entity.sortBy = '';
  querySearchCourse();
}
//最新课程
const handleNewCourse = () => {
  priceSortBy.value = '2'
  queryCoursePrams.entity.sortBy = 'time-desc';
  querySearchCourse();
}
//最多购买
const mostbuy = () => {
  priceSortBy.value = '3'
  queryCoursePrams.entity.sortBy = 'purchase-desc';
  querySearchCourse();
}
//价格
const handlePrice = () => {

  if (priceSortBy.value == '4' || priceSortBy.value != '5') {
    priceSortBy.value = '5'
    queryCoursePrams.entity.sortBy = 'price-desc';
  } else if (priceSortBy.value == '5') {
    priceSortBy.value = '4'
    queryCoursePrams.entity.sortBy = 'price-asc';
  }
  querySearchCourse();
}
</script>


<style scoped>
.course-main {
  padding: 20px 0;
  width: 100%;
  height: 130px;
  background: #f3f5f9;
}

.search-container {
  width: 1200px;
  margin: 0 auto;
  position: relative;
  height: 100%;
}

.search-item {
  display: flex;
  overflow: hidden;
  cursor: pointer;
  position: absolute;
  height: 45px;
  transition: all 0.5s;
}

.search-item-transition:hover {
  z-index: 777;
  height: auto;
  box-shadow: rgb(95 101 105 / 10%) 0px 12px 20px 0px;
  border-radius: 8px;
  background: rgba(255, 255, 255);
}

.search-item .title-name {
  width: 100px;
  font-size: 16px;
  font-family: Microsoft YaHei;
  font-weight: bold;
  line-height: 25px;
  text-align: justify;
  color: #333333;
  padding: 10px;
  opacity: 1;
}

.search-item .title-name:after {
  content: '.';
  width: 100%;
  display: inline-block;
  overflow: hidden;
  height: 0;
}

.search-item .all-items {
  width: calc(100% - 120px);
  min-height: 25px;
  display: flex;
  flex-wrap: wrap;
}

.title .all-list {
  width: 40px;
  height: 25px;
  line-height: 25px;
  border-radius: 4px;
  padding: 0 10px;
  align-items: center;
  text-align: center;
}

.title .all {
  opacity: 1;
  color: #2c80ff;
}

.title .item {
  height: 25px;
  line-height: 25px;
  margin: 0 15px;
  font-size: 16px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  line-height: 21px;
  opacity: 1;
}

.title .item .active {
  color: #2c80ff;
}

.category-poniter {
  height: 25px;
  line-height: 25px;
  margin: 10px 5px;
  cursor: pointer;
  border: none;
  background: rgba(44, 128, 255, 0.1);
  color: #2c80ff;
}

.category-poniter-item {
  height: 25px;
  line-height: 25px;
  margin: 10px 5px;
  cursor: pointer;
  border: none;
  background: none;
  color: rgba(81, 87, 89, 1);
}

.main-container {
  width: 1200px;
  margin: 0 auto;
}

.container-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}

.all {
  display: flex;
  padding-top: 20px;
  font-size: 16px;
  color: #515759;
}

.all .item:first-child {
  margin-right: 20px;
}

.all .item {
  margin: 0 10px;
  cursor: pointer;
}

.right {
  display: flex;
  padding-top: 20px;
  font-size: 16px;
  color: #515759;
}

.right .right-item {
  margin-left: 10px;
}

.right .right-items {
  margin-right: 0px;
}

.arrow {
  position: relative;
}

.arrow i:first-child {
  position: absolute;
  top: -1px;
}

.arrow i:last-child {
  position: absolute;
  top: 7px;
}

.check {
  width: 15px;
  height: 15px;
  cursor: pointer;
}

.up {
  position: absolute;
  top: 5px;
  left: 2px;
}

.down {
  position: absolute;
  top: 15px;
  left: 2px;
  transform: rotate(180deg);
  -ms-transform: rotate(180deg);
  /* IE 9 */
  -moz-transform: rotate(180deg);
  /* Firefox */
  -webkit-transform: rotate(180deg);
  /* Safari 和 Chrome */
  -o-transform: rotate(180deg);
  /* Opera */
}

.newCourseContent {
  width: 1200px;
  margin: 30px auto 0px auto;
}

.newCourseContent .courseUl {
  display: flex;
  flex-wrap: wrap;
}

.courseItem {
  width: 285px;
  height: 280px;
  margin: 0 20px 20px 0;
  transition: margin-top 0.2s;
}

.courseItem:hover {
  margin-top: -10px;
  cursor: pointer;
}

.courseItem:nth-child(4n+0) {
  margin-right: 0 !important;
}

.courseInfo {
  position: relative;
  width: 100%;
  height: 270px;
  background: #ffffff;
  box-shadow: 1px 1px 10px rgb(27 39 94 / 40%);
  opacity: 1;
  border-bottom-left-radius: 6px;
  border-bottom-right-radius: 6px;
  overflow: hidden;
  text-decoration: none;
}

.courseBg {
  position: relative;
  width: 100%;
  height: 160px;
}

.courseBg img {
  width: 100%;
  height: 100%;
}

.courseName {
  margin: 10px;
  font-weight: bold;
  font-size: 14px;
  color: #333333;
  display: -webkit-box;
  overflow: hidden;
}

.courseDegree {
  margin-left: 10px;
  font-size: 12px;
  color: #808080;
}

.coursePrice {
  display: flex;
  justify-content: space-around;
  align-items: center;
  width: 130px;
  font-size: 14px;
  margin-top: 15px;
  padding: 0 5px;
}

.coursePricePri {
  width: 75px;
  font-size: 14px;
  margin-top: 18px;
  padding: 0 13px;
  color: rgba(255, 114, 127, 1);
  font-weight: 700;
}

.coursePriceZero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 75px;
  font-size: 14px;
  margin-top: 15px;
  padding: 0 10px;
  color: rgba(53, 134, 255, 1);
}

.courseMemberbg {
  position: relative;
  width: 80px;
  height: 20px;
  color: #ffffff;
  background: linear-gradient(90deg, #ff928e 0%, #fe7062 99%);
  border-radius: 24px 0px 24px 0px;
}

.courseMember {
  position: absolute;
  line-height: 20px;
  left: 13px;
  font-weight: 700;
}

.price {
  line-height: 25px;
  left: 100px;
  color: #ff727f;
  font-weight: 700;
}
</style>